Hawk, right. Cuckoos have turned into copy cats in order to trick unsuspecting reed warblers into caring for their young. According to a recent study, cuckoos have evolved similar plumage to sparrow hawks, a warbler predator. Read more at BBC Earth News. Heres how it works: The cuckoos show their striped, hawk-like underbellies to the warblers, which flee, thinking they are under attack by sparrow hawks.
http://blogs.discovery.com/animal_news/2011/04/cuckoos-copy-hawks-to-scare-and-leave-eggs-with-reluctant-nanny-warblers.html?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed: AnimalNewsAnimalPlanet (Animal News: